High-efficiency HTP ELU-85WBN wall-mount boiler has a 95.0 AFUE rating. This unit is compatible with natural gas or propane. The black and grey exterior measures approximately 29 inches in height and 17 inches in width. It includes copper piping and a PVC elbow attachment. It was used for a year but ended up being too small for the house. Looking for $2000 but willing to negotiate.